No less than 64 individuals lost their lives in a security raid cracking down on the organized crime group in the Brazilian city's northern suburbs - the most extensive and fatal action in the region's past.
Four police officers lost their lives during the security mission in the Alemão and Penha districts, local authorities said. Over 80 individuals were detained.
Fierce clashes erupted when around 2,500 police forces initiated the operation on Tuesday early hours. The Comando Vermelho countered with gunfire, burning barricades and dropping bombs from drones, police representatives stated.
The United Nations human rights body said it was "shocked" by the law enforcement raid, demanding "swift and comprehensive examinations".
The informal settlements adjacent to the city's international airport is regarded as the central command of one of Brazil's most powerful illegal networks.
Government representatives said no less than 50 of the deceased were "classified by law enforcement as potential lawbreakers".
Dozens of people were wounded, including non-combatants affected by the violence.
Residents have described the elevated neighborhood - housing around 300,000 people - to a "battlefield" since the operation began.
Roads remain closed in the entire neighborhood.
The Comando Vermelho organization has been increasing their influence in the area, growing illegal substance trade paths and power in the informal settlements.
Security forces reported in excess of 200kg (441lb) of drugs were confiscated in the operation, along with multiple guns.
The coordinated mission by different law enforcement agencies follows a extended probe.
Dozens of the suspects are believed to be participants in an organization from the Brazilian state who are at the moment taking refuge in the metropolitan area.
Extensive security missions are frequent in Brazil before significant global gatherings in the South American nation.
The international environmental meeting COP30 is scheduled in the northern city of Belem in November.
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